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Generate CSR from Pre-Existing Private Key

See more CSR Examples

Demonstrates how to generate a Certificate Signing Request (CSR) from a pre-existing RSA private key.

Note: This example requires Chilkat v9.5.0.65 or greater.

Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // Note: Requires Chilkat v9.5.0.65 or greater.

    // This requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    const priv_key = try chilkat.PrivateKey.init();
    defer priv_key.deinit();

    // Load the private key from a file.
    // (Chilkat provides the ability to load private keys from many different
    // formats and sources..)
    priv_key.loadEncryptedPemFile("qa_data/rsa/privKey1.pem", "password") catch {
        std.debug.print("{s}\n", .{try priv_key.getLastErrorText(alloc)});
        return;
    };

    // Create the CSR object and set properties.
    const csr = try chilkat.Csr.init();
    defer csr.deinit();

    // Specify the Common Name.  This is the only required property.
    // For SSL/TLS certificates, this would be the domain name.
    // For email certificates this would be the email address.
    csr.setCommonName("mysubdomain.mydomain.com");

    // Country Name (2 letter code)
    csr.setCountry("GB");

    // State or Province Name (full name)
    csr.setState("Yorks");

    // Locality Name (eg, city)
    csr.setLocality("York");

    // Organization Name (eg, company)
    csr.setCompany("Internet Widgits Pty Ltd");

    // Organizational Unit Name (eg, secion/division)
    csr.setCompanyDivision("IT");

    // Email address
    csr.setEmailAddress("support@mydomain.com");

    // Create the CSR using the private key.
    const pem_str = csr.genCsrPem(alloc, priv_key) catch {
        std.debug.print("{s}\n", .{try csr.getLastErrorText(alloc)});
        return;
    };

    // Save the CSR..
    const fac = try chilkat.FileAccess.init();
    defer fac.deinit();
    fac.writeEntireTextFile("qa_output/csr1.pem", pem_str, "utf-8", false) catch {};

    // Show the CSR.
    std.debug.print("{s}\n", .{pem_str});

    // Sample output:
    // The CSR PEM can be checked here:
    // https://www.networking4all.com/en/support/tools/csr+check/
    // Copy-and-paste the PEM into the online CSR Decoding / CSR Verification form

    //     -----BEGIN CERTIFICATE REQUEST-----
    //     MIIC6jCCAdICAQAwgaQxITAfBgNVBAMMGG15c3ViZG9tYWluLm15ZG9tYWluLmNv
    //     bTELMAkGA1UEBhMCR0IxDjAMBgNVBAgMBVlvcmtzMQ0wCwYDVQQHDARZb3JrMSEw
    //     HwYDVQQKDBhJbnRlcm5ldCBXaWRnaXRzIFB0eSBMdGQxCzAJBgNVBAsMAklUMSMw
    //     IQYJKoZIhvcNAQkBFhRzdXBwb3J0QG15ZG9tYWluLmNvbTCCASIwDQYJKoZIhvcN
    //     AQEBBQADggEPADCCAQoCggEBALnQ0un/wF8whk+gPuiAlf3qvx14jgAOV6Erm6EB
    //     H7WACPCpnKcm/8KP+7uoPiwRQaENhMeCgf45vcivl2p6aAn/spLXyEkXyw2d8wFb
    //     YYAGRkiz4Xf7ASJiKuwcOtORz+sSDzgtdfokHfXU1cYeFE2yQhSdLUY5fMn425+g
    //     KoEEsRSjSDe6AKru4+4iGNrLKd8pB9IA5/jOE139IkWlB9r5fEPD5bUTsgqXk9eb
    //     68O0gc712V2eZK07N24lDmFC4bIMTD4csDWocR5hFHXj7NX7c8sOBDcpEb9mPIk4
    //     elxubnhkfnjhOi4J3lDHcT/0ALnbLhf9LnaiKqs+5VcVZvECAwEAAaAAMA0GCSqG
    //     SIb3DQEBBQUAA4IBAQC0AETLIcP3foh5nbu2hVFS8uCUNZ5hEIR1eXmYZmZoBQq2
    //     26ZAoT4CZwixlggC+n7WvAXJ5Pzxpl4wLV4loTiQzaKPX1w0ERo5ZRwLy0n56oG2
    //     6QG+WTViT1C8rlgtVwkCFNOXr0kSSRs8FdaPllqKxK1hxYSL7zwNpumsk39F2cDt
    //     vhcekvH0V3BuGrQFm3dKN/0azW6GOod9+Vq4VzSyOe3kp15oxLBsZOFOu/REujcw
    //     Tzu2jt1asQKUm60CZ9wNHpYepR0Ww40uP1slbehEaFDa6V8b60/tlHHmBbJ4/fy5
    //     hJnYCvjzFz4O9VtT+JtP9ldRHWV3KpZ8ne3AjD+F
    //     -----END CERTIFICATE REQUEST-----
}